额外标签法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.father {
width: 400px;
background-color: pink;
}
.son {
float: left;
width: 100px;
height: 400px;
background-color: blue;
}
.clearfix {
clear: both;
}
</style>
</head>
<body>
<div class="father">
<div class="son"></div>
<div class="clearfix"></div>
</div>
</body>
</html>
单伪元素清除法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.father {
width: 400px;
background-color: pink;
}
.son {
float: left;
width: 100px;
height: 400px;
background-color: blue;
}
.clearfix::after {
content: '';
display: block;
clear: both;
}
/* 补充写法 */
.clearfix::after {
content: '';
display: block;
clear: both;
height: 0;
visibility: hidden;
}
</style>
</head>
<body>
<div class="father clearfix">
<div class="son"></div>
</div>
</body>
</html>
双伪元素清除法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.father {
width: 400px;
background-color: pink;
}
.son {
float: left;
width: 100px;
height: 400px;
background-color: blue;
}
/* 防止 margin-top 塌陷 */
.clearfix::before,
.clearfix::after {
content: '';
display: table;
}
.clearfix::after {
clear: both;
}
</style>
</head>
<body>
<div class="father clearfix">
<div class="son"></div>
</div>
</body>
</html>
添加 overflow
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.father {
width: 400px;
background-color: pink;
overflow: hidden;
}
.son {
float: left;
width: 100px;
height: 400px;
background-color: blue;
}
</style>
</head>
<body>
<div class="father">
<div class="son"></div>
</div>
</body>
</html>